<!--
 * @Author: Bo Cai
 * @Mail: caibo0520@qq.com
 * @Date: 2021-12-13 17:38:54
 * @LastEditors: Bo Cai
 * @LastEditTime: 2021-12-13 21:47:41
-->
<template>
    <div class="app-container">
        <!--表单-->
        <el-form :inline="true" class="demo-form-inline">
            <el-form-item>
                <el-select
                    v-model="searchObj.type"
                    clearable
                    placeholder="请选择"
                >
                    <el-option label="学员登录数统计" value="login_num" />
                    <el-option label="学员注册数统计" value="register_num" />
                    <el-option label="课程播放数统计" value="video_view_num" />
                    <el-option label="每日课程数统计" value="course_num" />
                </el-select>
            </el-form-item>

            <el-form-item>
                <el-date-picker
                    v-model="searchObj.begin"
                    type="date"
                    placeholder="选择开始日期"
                    value-format="yyyy-MM-dd"
                />
            </el-form-item>
            <el-form-item>
                <el-date-picker
                    v-model="searchObj.end"
                    type="date"
                    placeholder="选择截止日期"
                    value-format="yyyy-MM-dd"
                />
            </el-form-item>
            <el-button
                :disabled="btnDisabled"
                type="primary"
                icon="el-icon-search"
                @click="showChart()"
                >查询</el-button
            >
        </el-form>

        <div class="chart-container">
            <div id="chart" class="chart" style="height: 500px; width: 100%" />
        </div>
    </div>
</template>
<script>
import echarts from 'echarts'
import daily from '@/api/statistics/daily'

export default {
    data() {
        return {
            searchObj: {
                type: '',
                begin: '',
                end: '',
            },
            btnDisabled: false,
            chart: null,
            title: '',
            xData: [],
            yData: [],
        }
    },
    methods: {
        showChart() {
            this.initChartData()
            this.setChart()
        },

        // 准备图表数据
        initChartData() {
            daily.showChart(this.searchObj).then((response) => {
                // 数据
                this.yData = response.data.dataList
                // 横轴时间
                this.xData = response.data.dateList
                // 当前统计类别
                switch (this.searchObj.type) {
                    case 'register_num':
                        this.title = '学员注册数统计'
                        break
                    case 'login_num':
                        this.title = '学员登录数统计'
                        break
                    case 'video_view_num':
                        this.title = '课程播放数统计'
                        break
                    case 'course_num':
                        this.title = '每日课程数统计'
                        break
                }
                this.setChart()
            })
        },
        // 设置图标参数
        setChart() {
            // 基于准备好的dom，初始化echarts实例
            this.chart = echarts.init(document.getElementById('chart'))
            // console.log(this.chart)
            // 指定图表的配置项和数据
            var option = {
                xAxis: {
                    type: 'category',
                    data: this.xData, //-------绑定数据
                },
                // y轴是数据轴（连续数据）
                yAxis: {
                    type: 'value',
                },
                // 系列列表。每个系列通过 type 决定自己的图表类型
                series: [
                    {
                        // 系列中的数据内容数组
                        data: this.yData, //-------绑定数据
                        // 折线图
                        type: 'line',
                    },
                ],
                title: {
                    text: this.title,
                },
                tooltip: {
                    trigger: 'axis',
                },
                dataZoom: [
                    {
                        show: true,
                        height: 30,
                        xAxisIndex: [0],
                        bottom: 30,
                        start: 10,
                        end: 80,
                        handleIcon:
                            'path://M306.1,413c0,2.2-1.8,4-4,4h-59.8c-2.2,0-4-1.8-4-4V200.8c0-2.2,1.8-4,4-4h59.8c2.2,0,4,1.8,4,4V413z',
                        handleSize: '110%',
                        handleStyle: {
                            color: '#d3dee5',
                        },
                        textStyle: {
                            color: '#fff',
                        },
                        borderColor: '#90979c',
                    },
                    {
                        type: 'inside',
                        show: true,
                        height: 15,
                        start: 1,
                        end: 35,
                    },
                ],
            }
            this.chart.setOption(option)
        },
    },
}
</script>